<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .x{
            width: 200px;
            height: 200px;
            background-color: skyblue;
            /* transition: 变化的属性 花费时间 运动曲线 何时开始; */
            transition: all 0.5s ease .2s;
        }
        .x:hover{
            filter: blur(5px);
            width: 500px;
            height: 500px;
        }
    </style>
</head>
<body>
    <div class="x"></div>
</body>
</html>